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The Development of a NOx Reduction System during the Fuel Cut Period for Gasoline Vehicles
Technical Paper
2019-01-1292
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Generally, vehicles do not need power during deceleration. Therefore, the fuel efficiency can be improved by stopping the fuel injection in this period. However, when the fuel cut is activated, NOx is emitted immediately after fuel cut. During the fuel cut period, a large amount of fresh air flows into the catalytic converter installed on a vehicle since there is no combustion. Thus, the catalytic materials are converted into an oxidizing atmosphere. As a result, NOx purification performance of the catalyst deteriorates, and eventually NOx is emitted when combustion restarts. The quantity of NOx in this period is relatively small. However, in case of increasing fuel cuts, emission problem could arise. Therefore, in order to meet the stringent regulation such as LEV III-SULEV20 or 30, the number of fuel cuts need to be limited. The problem is that this strategy leads to a disadvantage of fuel efficiency. In order to solve this problem, in this study, the principle and process of NOx during the fuel cut period was analyzed in detail and then a new catalyst concept has been proposed, designed and tested. The new catalyst concept has functions of both TWC (three-way catalyst) and NSC (NOx Storage Catalyst). A variety of tests have been conducted to evaluate the purification performances, durability and so on. As a result, NOx emitted after fuel cut was reduced to more than 50% of conventional TWC under the same volume, density and cost(less precious metal quantity) conditions. Therefore, it is possible to increase the number of fuel cuts during FTP-75 and then an I4 LEV III-SULEV30 vehicle has an improvement to more than 2% of fuel efficiency on FTP-75 while meeting the SULEV30 NOx standard.
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Citation
Choi, M., Song, J., Lee, E., Ma, S. et al., "The Development of a NOx Reduction System during the Fuel Cut Period for Gasoline Vehicles," SAE Technical Paper 2019-01-1292, 2019, https://doi.org/10.4271/2019-01-1292.Data Sets - Support Documents
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References
- Kumar , S. The SULEV (Super Ultra Low Emission Vehicle) Challenge SAE Technical Paper 2003-26-0021 2003 10.4271/2003-26-0021
- Kidokoro , T. , Hoshi , K. , Hiraku , K. , and Satoya , K. Development of PZEV Exhaust Emission Control System SAE Technical Paper 2003-01-0817 2003 10.4271/2003-01-0817
- Hallgren , B.E. and Heywood , J.B. Effects of Substantial Spark Retard on SI Engine Combustion and Hydrocarbon Emissions SAE Technical Paper 2003-01-3237 2003 10.4271/2003-01-3237
- Tanner , C. , Twiggs , K. , Tao , T. , Bronfenbrenner , D. et al. High Porosity Substrates for Fast-Light-Off Applications SAE Technical Paper 2015-01-1009 2015 10.4271/2015-01-1009
- Yi , S. , Kim , H. , Quelhas , S. , Giler , C. et al. Investigation of a Catalyst and Engine Management Solution to Meet LEV III-SULEV with Reduced PGM SAE Technical Paper 2014-01-1506 2014 10.4271/2014-01-1506
- Heywood , J.B. International Combustion Engine Fundamentals, International Edition McGraw-Hill, Inc. 1988 578 586 0-07-100499-8
- Yoshida , T. , Suzuki , H. , Aoki , Y. , Hayashi , N. et al. Development of a New Ceramic Substrate with Gas Flow Control Functionality SAE Int. J. Engines 10 4 2017 10.4271/2017-01-0919
- Miyoshi , N. , Matsumoto , S. , Katoh , K. , Tanaka , T. et al. Development of New Concept Three-Way Catalyst for Automotive Lean-Burn Engines SAE Technical Paper 950809 1995 10.4271/950809
- Susanne , P. , Ruediger , H. , Frank , A. , and Stephan , E. Exhaust Gas Aftertreatment for Lean Gasoline Direct Injection Engines - Potential for Future SAE Technical Paper 2013-01-1299 2013 10.4271/2013-01-1299